Properties of the Number 21136

Twenty-One Thousand One Hundred Thirty-Six

Basics

Value: 21135 → 21136 → 21137

Parity: even

Prime: No

Previous Prime: 21121

Next Prime: 21139

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 ⁴ × 1321

Divisors: 1, 2, 4, 8, 16, 1321, 2642, 5284, 10568, 21136

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101001010010000

Octal: 51220

Duodecimal: 10294

Hexadecimal: 5290

Square: 446730496

Square Root: 145.38225476308997

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Number of partitions of n with positive rank. A64173

Triangle read by rows: number of permutations of [1..n] with k progressions of rise 2, distance 1 and length 3 (n >= 0, k >= 0). A216716

Number of partitions of n having population standard deviation > 1. A238619

Number of partitions of n having population standard deviation >= 1. A238620

Sophie Germain 5-almost primes. A211162

a(n) is the number of regular hexagons with all six vertices (x,y,z) in the set {1,2,...,n}³. A338322

Number of iterations before a repeated value, or -1 if this never occurs, when starting at k = 1 and repeating k = k·n if k does not contain any adjacent equal digits, else k = k with all adjacent equal digits replaced by a single copy of the same digit. A368940

Expansion of g²/(1 + x⁴*g⁴), where g = 1+x·g³ is the g.f. of A001764. A391303

Number of permutations of 1..n with all differences of elements separated by distances 1 through 6 being respectively unique. A170812

a(n) = (2n+1)!/n!². A2457